diff --git a/db/install.xml b/db/install.xml
index f2814ed..82e5a7f 100755
--- a/db/install.xml
+++ b/db/install.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="admin/tool/excimer/db" VERSION="20230216" COMMENT="XMLDB file for Moodle admin/tool/excimer"
+<XMLDB PATH="admin/tool/excimer/db" VERSION="20230829" COMMENT="XMLDB file for Moodle admin/tool/excimer"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
@@ -23,7 +23,7 @@
         <FIELD NAME="cookies" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Are any cookies set?"/>
         <FIELD NAME="buffering" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Is buffering set?"/>
         <FIELD NAME="responsecode" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="HTTP response code, or 0/1 for command line"/>
-        <FIELD NAME="referer" TYPE="char" LENGTH="256" NOTNULL="true" SEQUENCE="false" COMMENT="Refering URL, if any"/>
+        <FIELD NAME="referer" TYPE="text" NOTNULL="false" SEQUENCE="false" COMMENT="Refering URL, if any"/>
         <FIELD NAME="pid" TYPE="int" LENGTH="11" NOTNULL="true" SEQUENCE="false" COMMENT="Process ID"/>
         <FIELD NAME="hostname" TYPE="char" LENGTH="256" NOTNULL="true" SEQUENCE="false" COMMENT="Host name (empty for CLI scripts)"/>
         <FIELD NAME="useragent" TYPE="char" LENGTH="256" NOTNULL="true" SEQUENCE="false" COMMENT="User agent (empty for CLI scripts)"/>
diff --git a/db/upgrade.php b/db/upgrade.php
index 2d6f981..afa05bf 100644
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -444,5 +444,20 @@ function xmldb_tool_excimer_upgrade($oldversion) {
         upgrade_plugin_savepoint(true, 2023050800, 'tool', 'excimer');
     }
 
+    if ($oldversion < 2023082900) {
+
+        // Define field id to be changed in tool_excimer_profiles.
+        $table = new xmldb_table('tool_excimer_profiles');
+        $field = new xmldb_field('referer', XMLDB_TYPE_TEXT, null, null, false);
+
+        // Conditionally change the referer field.
+        if ($dbman->field_exists($table, $field)) {
+            $dbman->change_field_default($table, $field);
+        }
+
+        // Excimer savepoint reached.
+        upgrade_plugin_savepoint(true, 2023082900, 'tool', 'excimer');
+    }
+
     return true;
 }
diff --git a/version.php b/version.php
index 9a497fb..8ed8304 100644
--- a/version.php
+++ b/version.php
@@ -25,8 +25,8 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version = 2023060200;
-$plugin->release = 2023060200;
+$plugin->version = 2023082900;
+$plugin->release = 2023082900;
 $plugin->requires = 2017051500;    // Moodle 3.3 for Totara support.
 $plugin->supported = [35, 401];     // Supports Moodle 3.5 or later.
 // TODO $plugin->incompatible = ;  // Available as of Moodle 3.9.0 or later.